/*
 * Copyright 2013-2022 Xia Jun(3979434@qq.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************************************
 *                                                                                     *
 *                        Website : http://www.farsunset.com                           *
 *                                                                                     *
 ***************************************************************************************
 */
package com.farsunset.cim.group;


import com.farsunset.cim.constant.ChannelAttr;
import io.netty.channel.Channel;


/**
 * 基于内存管理的channel组
 * 根据tag管理，多个链接共用一个tag
 */
public class TagSessionGroup extends SessionGroup {

    /**
     * 返回Nio链接的标识
     * @param channel Nio链接
     * @return 标签
     */
    @Override
    protected String getKey(Channel channel){
        return channel.attr(ChannelAttr.TAG).get();
    }
}